Lowtech Graph lists low-tech options for every need of a home. Here you can compare them, find tutorials to build them, and link them together into a circular system. Why low-tech?
Holding electricity from when it is made until when it is wanted, which for solar means from the afternoon to the evening. Storage is usually the most expensive part of an off-grid system and the part that wears out first. The options differ in how much of what goes in comes back out, and in how long they last.
Ranked by round-trip efficiency, the share of stored energy you get back, together with usable depth of discharge and cycle life, since a battery you can only half-empty stores half of what it nominally holds. Lithium iron phosphate leads on all three. Compressed air loses a large fraction as heat during compression, which is the physical reason it trails despite having no chemistry to degrade.